102
No
Nobelium
259
Nobelium (No)
ActinidePeriod 7f-block-blockRadioactive
Nobelium is a synthetic chemical element with symbol No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science. A radioactive metal, it is the tenth transuranic element and is the penultimate member of the actinide series.
Latin name: Nobelium
Atomic Number
102
Atomic Mass
259 g/mol
Phase (STP)
Solid (predicted)
Electron Config.
[Rn] 5f¹⁴ 7s²
General
SymbolNo
Atomic Number102
Atomic Mass259 g/mol
CategoryActinide
Period7
Blockf-block
Electron Configuration[Rn] 5f¹⁴ 7s²
Valence Electrons16
Coloursilvery (predicted)
Physical Properties
Phase (STP)Solid (predicted)
Density9.9 (predicted)
Melting Point1100 (predicted)
Boiling Point3000 (predicted)
Atomic Properties
Atomic Radius246 pm
Electronegativity1.3 Pauling
Ionization Energy642 kJ/mol
Oxidation States+2, +3
Ion ChargeNo2+/No3+
Nuclear & Hazards
RadioactiveYes
Half-life58 minutes (No-259)
Abundance
In Earth's Crust0%
Discovery & History
Discovery Year1958
Discovered ByJoint Institute for Nuclear Research (Dubna, USSR) and Nobel Institute for Physics (Sweden)
Country of DiscoveryUSSR/Sweden
Isotopes of Nobelium
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| No-255 | — | 3.1 minutes | α, EC |
| No-259 | — | 58 minutes | α, EC, SF |